Vulnerability-Lookup

GHSA-GMMJ-CHCC-2F2X

Vulnerability from github – Published: 2026-05-11 03:31 – Updated: 2026-05-11 03:31

Details

A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue.

Severity ?

3.3 (Low)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

1.9 (Low)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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{
  "affected": [],
  "aliases": [
    "CVE-2026-8257"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-11T02:16:27Z",
    "severity": "LOW"
  },
  "details": "A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue.",
  "id": "GHSA-gmmj-chcc-2f2x",
  "modified": "2026-05-11T03:31:31Z",
  "published": "2026-05-11T03:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8257"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WebAssembly/binaryen/issues/8633"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WebAssembly/binaryen/pull/8635"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WebAssembly/binaryen"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/809552"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/362554"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/362554/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-8257 (GCVE-0-2026-8257)

Vulnerability from cvelistv5 – Published: 2026-05-11 00:30 – Updated: 2026-05-11 17:31 X_Open Source

Title

WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

Summary

Severity ?

4.8 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

3.3 (Low)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

3.3 (Low)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

CWE

CWE-617 - Reachable Assertion

Assigner

VulDB

References

8 references

URL	Tags
https://vuldb.com/vuln/362554	vdb-entrytechnical-description
https://vuldb.com/vuln/362554/cti	signaturepermissions-required
https://vuldb.com/submit/809552	third-party-advisory
https://github.com/WebAssembly/binaryen/issues/8633	issue-tracking
https://github.com/WebAssembly/binaryen/pull/8635	issue-trackingpatch
https://github.com/HackC0der/CVE-Repos/blob/main/…	exploitpatch
https://github.com/WebAssembly/binaryen/commit/12…	patch
https://github.com/WebAssembly/binaryen/	product

Impacted products

1 product

Vendor	Product	Version
WebAssembly	Binaryen	Affected: 117 cpe:2.3:a:webassembly:binaryen::::::::

Credits

pwn3rd (VulDB User)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-8257",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-11T15:57:14.190670Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-05-11T17:31:23.327Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "BrOn Parser"
          ],
          "product": "Binaryen",
          "vendor": "WebAssembly",
          "versions": [
            {
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              "version": "117"
            }
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "pwn3rd (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue."
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      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
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        },
        {
          "cvssV3_1": {
            "baseScore": 3.3,
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            "version": "3.1"
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            "version": "3.0"
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        },
        {
          "cvssV2_0": {
            "baseScore": 1.7,
            "vectorString": "AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C",
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      ],
      "problemTypes": [
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      "providerMetadata": {
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          ],
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        },
        {
          "name": "VDB-362554 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/362554/cti"
        },
        {
          "name": "Submit #809552 | WebAssembly Community Binaryen main branch commit 3ef8d19 (v117 development version, vulnerable version before fix commit 1251efb) Fixed version: commit 1251ef Assertion Failure, Denial of Service (Local DoS)",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/809552"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/WebAssembly/binaryen/issues/8633"
        },
        {
          "tags": [
            "issue-tracking",
            "patch"
          ],
          "url": "https://github.com/WebAssembly/binaryen/pull/8635"
        },
        {
          "tags": [
            "exploit",
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          ],
          "url": "https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19"
        },
        {
          "tags": [
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          "url": "https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c"
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        {
          "tags": [
            "product"
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          "url": "https://github.com/WebAssembly/binaryen/"
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      "tags": [
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          "value": "Advisory disclosed"
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          "lang": "en",
          "time": "2026-05-10T02:00:00.000Z",
          "value": "VulDB entry created"
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          "lang": "en",
          "time": "2026-05-10T17:02:16.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion"
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  },
  "cveMetadata": {
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    "datePublished": "2026-05-11T00:30:13.661Z",
    "dateReserved": "2026-05-10T14:57:05.580Z",
    "dateUpdated": "2026-05-11T17:31:23.327Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-GMMJ-CHCC-2F2X

CVE-2026-8257 (GCVE-0-2026-8257)

Tags

Sightings

Nomenclature